Snap Settings Are Now Remembered
In older versions the snap settings were not saved from session to session. This has been fixed.

Revised Layer Table Dialog Box
Added controls to globally change the on/off states and paint/scratch/negative states of all active layers.

Gerber Union Layer Control Setting
Added radio button controls labeled "Single Layer Output" and "Multi Layer Output". These control whether or not unionization is done between layers. If "Single...", it is per layer and between layers. If "Multi..." it is only done per layer.

Speed Improvement with Data Clipping
Clip Gerber data prior to union operation. The speed is most noticeable when the user selects only a small part of a layer to booleanize.

Shortened log to report only errors
Prior to this release the log file contained much information making it difficult to spot the warning and error messages. This has been fixed.

Bug fix to clipping rectangular or square traces.
Prior to this version, Gerber draws using a square or rectangular aperture were not correctly clipped at a window boundary. This has been fixed.

Bug fix to plotting rectangular or square traces.
Traces with rectangular or square apertures were incorrectly plotted with half the dimensions of the aperture. This has now been fixed.

Revise "Gerber Union" tool.

1)Added "Auto" Rectangular Partitioning to automatically define a set of
  partitioning windows, in addition to being able to define them
  manually through the "Manual" option.

2)Boolean differencing is now applied to scratch layers from the paint
  layer it is scratching out.

Fix to "Gerber Union" tool.
The tool was crashing upon reading certain Gerber files. The intermediate file generation that precedes unionization was doing a memory access violation when a certain sequence of elements were read. This has now been fixed.

Added "Data Window" Controls.
These define the window that contains the data that is to be partitioned and unionized. The partitioning control has to be set for these controls to be active.

Added "Sliver" settings controls.
When the checkbox is set, polygons that are consistently narrower than the value specified in the editbox are removed.

Added "Gerber Union Memory (MB)"
Edit box control to allow the user to control the memory usage of the tool.

This has two applications - 1. to convert RS274D into RS274X making it more reliable to transfer to board mfgs. 2. to combine multiple files generated by the Gerber Union program.

In the "Gerber Union" dialog box,  there is now an check box labeled
"Cut Lines" which controls whether or not to output booleanized polygons
with cut lines.  If not set, the cut lines are replaced by interior
polygons drawn on another layer different from the target layer.
Otherwise booleanized polygons may appear with cutlines.

When Cutlines is off
1)RS274D outputs one file per layer.
2)RS274X outputs one file containing dark and clear layers
3)DXF AND EGS outputs one file containing layers wilt no paint or scratch information

In the dialog box, if you specify 0, then there is no upper limit.

Added EGS Output for Agilent (EEsof) ADS/Momentum Import
A new output format, EGS (engineering graphics system) has been added in order to support users of Agilent's ADS and Momentum microwave design software. This enables such users to directly import the cleaned up polygons into their layout tools. (note: this is a separately licensed output module.)

Bug Fix - structure naming in GDSII output
Input file names with same base names but different file extensions were generating duplicate structure names in GDSII files.  This has now been fixed.
Example

testmda.001
testmda.002
testmda.003

Output File Directory
The output filename's directory could not be set to anything other than what the temporary working directory was set to. This problem only occurred when RS274D or RS274X output was being generated. This is now fixed.
Indicate when Gerber Union tool has completed its task. This means that the tool will show a messagebox indicating "Gbrunion output generated".

Bug fix with memory management
This bug deals with memory allocated during querying. It turns out that large amounts of memory were being allocated but not freed when traversing through a trace. This has now been fixed.

The three modules don't come with the standard gbrvu. You will need special key codes to activate these modules.

The following explains the usage of this tool.

1)Use "Tools|Gerber Union..." menu item to launch "Gerber Union"
  dialog box.

2)Set "Gerber Union" dialog box settings wherever necessary:

  a)"Sizing" specifies how much to grow the polygons.  If set to 0.0,
    the polygons will not be grown.

  f)"Smoothing" edit box specifies which line segments to take out.
    Any segments smaller than the length specified are taken out.
	This works with the "Sizing" control and was created to avoid the
	apearance of spikes when sizing.

  c)"Arc Resolution" setting controls how circular data is broken up 
    in degrees.  The finer of the arc resolution and the arc sag is
	used.

  d)"Arc Sag" setting controls how circular data is broken up 
    by specifying the perpendicular distance from an arc chord midpoint
	to the actual arc.  The finer of the arc resolution and the arc sag
	is used.


  e)"Cut Lines" check box controls whether or not to output
    booleanized polygons with cut lines.  If not set, the cut lines are
	replaced by interior polygons drawn on another layer different
	from the target layer.  Otherwise booleanized polygons may appear
	with cutlines.


  f)"Output File Name" is the name of the output file that will be
    generated.

3)Hit OK and the tool will generate the booleanized file in the selected format.