I'm suddenly having some problems with graphics on my PC. This is one we had in our office for a couple of years, and it worked with Aecosim without any problems. Might be that I changed the graphics card from AMD to Nvidia a while ago, found out that I had some AMD graphics drivers installed as well, which I removed now. Haven't experienced any problems in other programs.
The problem are the lines in the model, they are not real. You can't click on them either.
Card: Nvidia 8800GT, latest drivers
please find attached a discussion on your issue. This issue has found to be due to the Nvidia driver.
340.52 WHQL driver, released 2014-07-29
That's the latest driver they have.
From Nvidia email of 13.08.14:
Top Release Highlights*
OpenGL hardware acceleration on Windows Remote Desktop.
CUDA update to version 6.5.
Workstation application compatibility fixes.