When you select menu:
Plugin->SynchroScroll->Stop Synchro Scrolling , then you get error with not existing method (see attachement).
This is because of different method names in actions.xml and SynchroScrollPlugin.java files.
in actions.xml file you have : setSynchroScrollOff
in SynchroScrollPlugin.java file is : setSynchroscrollOff
SynchroScroll-1.1 Stop Synchro Scrolling bug
Fixed in 21444.
Thanks for your attention to detail.
This looks like a critical issue. I think we should not close such issues until at least a release is submitted.
Alan fixed this in revision 21444. It will be in the next release.
I can see still this issue after SynchroScroll plug-in installation.