Created attachment 50869 [details] Screen capture showing the bug The screen sometimes shows the names on the columns in the area of the spreadsheet. If you scroll up and down the spreadsheet it fixes. Also this behavior is present in 3.4.3 release. Tested on two different machines with Windows 7 and XP (sorry for my english)
It seems a problem with certain xls/xlsx document. Marked duplicate of Bug 40009. *** This bug has been marked as a duplicate of bug 40009 ***