if you press ~ (the key below "Esc") that should open the console.
if it doesn't, close BC, go to the shortcut and add "-TestMode" at the end of the path. like this:
"C:\...\...\Bridge Commander\stbc.exe" -TestMode
then, when you get that cursor, open the console, press enter and type:
App.g_kSystemWrapper.TakeScreenshot()
keep the capitals as they are. that should add a screenshot to the screenshots folder, post it here.
and never ever ever ever EVER use BCMP's file checker. you won't break anything, but it will screw BC up.