[Jakobuz]

When I want to upload and activate a new header picture in my theme, the new header picture isn’t saved, but when I disasable the bbpress-plugin the native header upload/saving works fine.

Somebody else encountered the same issue, I looked and tried everything to solve this problem, but no luck …

hopefully somebody can help me out!

[Robin W]

It could be a theme or plugin issue

Plugins

Deactivate all but bbpress and see if this fixes. if it does, re-enable one at a time to see which is causing the error.

Themes

If plugins don’t pinpoint the problem, as a test switch to a default theme such as twentytwelve, and see if this fixes.

Then come back

[Jakobuz]

Hai Robin, thanks for your answer and I must admit it helped:
I was too fast in my conclusion it was caused by bbpress, but it was an another (unimportant) plugin that caused the issue.
I feel relieved, thx 🙂

[Robin W]

Great – glad you’re fixed !