paulpaul
I tried your workflow above and it worked ok, but there for sure are scrolling problems.
So could you please detail
every move you make 
i.e.:
- what style is in use
- what location you import the audio to
- how many bars and choruses are set
- accessed via Audio Edit icon?
- auto marking enabled?
- auto analysis enabled?
- entering bar lines via L-keystrokes
- only happens at half speed?