While MicroStation Basic is still delivered with MicroStation V8i (SELECTseries) versions, it is no longer supported. If this is a vital application you will continue to rely on you should migrate it to VBA or some other supported language.
As far as your immediate problem is concerned my first thought is that something has gotten corrupted in your MicroStation installation or the workspace. Can you go to another computer with MicroStation installed and try debugging from there?
As far as your immediate problem is concerned my first thought is that something has gotten corrupted in your MicroStation installation or the workspace. Can you go to another computer with MicroStation installed and try debugging from there?