2D - Design » Access Violation at address 0040A72B in module

Hello,

Have been having a few issues with my MicroRouter V3 running on VRMilling V5.
Have just downloaded and installed the latest version of VRMillingV5 and Getting the following error pop up but no idea what it is.
Access Violation at address 0040A72B in module 'VRMilling5.exe'. Write of address 00000190
Before installing the newest version I was having issues with the Z-axis rising randomly during machining. The Z-Axis would rise without any noticable reason but the co-ordinates on screen didn't seem to be changing, so Assume the G-code isn't at fault..
Any Suggestions?

Any help will be apprecited.
I didn't find the right solution from the Internet.

References:
http://www.denfordata.com/bb/viewtopic.php?f=2&t=4537
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Thank you