Mixed up themes in DP9(.13)

[MediaComposer88]

Dear all,

I've been having this curious problem with mixed up themes ever since the first version of DP9.

I also have DP 8.07 installed, and there all themes work correctly. However, when for instance selecting the Medium Dark theme in DP9, the icons on the tool palette as well as the pan pots are somehow in the style of the theme called "Eight".

Recently, I tried quite a few things to see if it would fix my problem (complete re-install, delete preferences, delete older DP versions, replace themes with a zip-file from MOTU Tech Support as well as from a link I found on this forum) - however, nothing has changed.

Here are two screenshots which show what's happening exactly:
DP8.07 (correct) - http://imgur.com/a/KtueS
DP9.13 (incorrect) - http://imgur.com/a/ct3PA

Now, I was wondering if any of you are experiencing the same problem? If so, I'd be very interesting to hear it, as well as any possible solutions.

Kind regards,

Dennis