Make sure that Captivate 6 is updated to Captivate 6.0.1.240 or Captivate 6.1.0.319. : 6.0.0.199
Can you please tell me which operating system is it? Windows XP
If it is Windows 7, then is it Captivate 6 32 bit or 64 bit? 32Bit
Are you getting this issue on a particular project or on any project? Any project (simulation project)