Multiple accounts is buggy

Just bouth MailTab for Gmail pro, and found a bug...

I can log in in multiple accounts, but when trying to switch from one to another, it opens a pages in Chrome which only contains "Copyright 2002-2012 Google Inc.". Also, when going back in Mailtab, there is only the window with its icons, I have to click on the home icon to go back to Gmail web interface.

NZAU1984 about MailTab Pro for Gmail - Email Client, v5.3