It might or might not be the same problem.
I do believe, however, that it is the same problem, as far as it is about creating an accentuated letter with two key strokes, which is the case for the French â ê î ô û ä ë ï ö ü, as it is for the Spanish vowels+accent and the ñ.
I had that issue with CrossOver Linux 13.2.0 running on an Ubuntu-Mate 14.04 OS. Strangely enough, I could not get the accentuated letters (those that need two key strokes) in the main window of the application (Word document, Excel spreadsheet, etc.) BUT I could have them in the popup windows, like the ones you get when you do a "search" or a "search and replace".
For me, this issue was solved by going to "Language support", getting the language support applied to all applications and system-wide, and getting the input method switched from iBus to None. I did not try these 3 actions separately, so I don't know if the "input method" switch is sufficient or not to solve the problem.
Still, this is a bug that needs to be fixed.