The disappearing colon on the command line

Hi Everyone,

We have noticed that on some occasions the colon that proceeds a command will disappear from the command line. When this happens the system inevitably becomes wonky; sometimes the system locks up, sometimes it won't save, the operator may not be able to open a template, the saveas dialogue box won't appear, etc. The only way to correct the problem is to exit and restart Bricscad. Our concern is losing valuable data.

Has anyone else had similar experiences?

Thank you in advance for your help.
--
Phillip