CIS 4 blocks yahoo IM from installing

I recently installed CIS 4 and was unable to install yahoo IM. I allowed all messages D+/sandbox gave me but near 97% completion YIM just hung up. I completely shut down CIS 4 and still could not install YIM. Finally I uninstalled CIS 4, and YIM installed without any problems.

I also had this problem with comodo firewall way back with V2. For some reason, just having comodo on your computer prevents YIM from being installed and the only way to get it to work is to completely remove comodo from your computer.

It is possible that one of its processes was sandboxed. I believe that even if you tell it to never sandbox this file again you have to rerun the program as the file is already sandboxed.

If you received a sandbox alert while installing then this is probably the case.