Process Editor not working properly after update to 6.5.0

after updating Flowable to version 6.5.0 the transformation of the stencil keys is not working anymore
see picture:

Does anyone has a cluewhy this happens or what could be wrong?

Many thanks in advance

No, that’s for sure not something we’ve seen before. Does it happens consistently on different browsers?

(also note: 6.6.0 is the latest version released)

Many thanks to you for your reply.
Unfortunately it is browser independent.

BTW I know that 6.6.0 is the current version.
The upgrade to this version would be too complex at the moment as we just need some features which are already available in version 6.5.0.