This was an issue a couple of versions ago, but it has been resolved in version 14.
Which version of the program are you using and on what operating system?
Obviously it is still an issue. No worries, I have uninstalled the program and have moved on to another editor.
Yes, still an issue in PE14.
I have a workaround.
Enable Dual Monitor Workspace.
Maximize on secondary monitor.
Then select Restore workspace.
This puts timeline back, and gives you full screen on secondary monitor.
However: still jumps back sometimes, like in case of an error, ..
I would expect better support on this from Adobe.
(I use Win 7 prof 64 bit)
I found this very frustrating — it's very counter-intuitive, and is obviously a bug. I'd say this bug is so bad that if they don't plan to fix it, Adobe should give us all free upgrades to v15.