Cursor jumps to the end of timeline in CB7 (SOLVED)

Something strange has happened…

Working in a couple older or new projects (not heavy, just a HalionSonic SE VST and a couple of audio tracks), suddenly, but not always and in different parts of the project, the cursor jumps to the end of the timeline.

I tried…

clear PC cache
run memory cleaners
reset all midi files
save the project under a different name
remove unused media
empty trash
… no luck

any ideas???

thanks
@

Arranger track active maybe?

Solved (probably)

Un-check >> Transport > Use External Sync

Easy to activate this by mistake as the key command is a single key (T).