We had a customer report a strange issue that they could not minimize the MailCOPA email client on their machine. Obviously this was odd as this must be something that pretty much every customer does, it's also something that we do on every install we have.
After finding as many details as possible from the customer about their system and operating system we managed to build a system as close as possible to the problem system and lo and behold we managed to repeat the problem ourselves.
Very odd, and will only occur in a very few systems. This bug has been fixed for the upcoming beta release of the MailCOPA email client V12. We hope that V12 will enter beta testing in the next 1-2 weeks.
For more information please see the MailCOPA email client web pages.