Hi Rafo - I also ran into this issue. It appears that this is now fixed in the latest beta channel release which can be found at the bottom of this thread:
Download at Axure | Release Candidate or via Help > Check for Updates (with “Include beta channel builds” selected) in RP
Risk: Low-Medium
Axure RP 9.0.0.3686
The design area will reflect when widgets are set to selected or disabled in Axure RP
Optionally show thumbnails on the Pages and Outline panes on hover (set in Preferences)
Browser player frame shows the page count and current page number when the pages sidebar is collapsed
Fixed global variables resetting in the HTML when opening a l…