All my saved tracks are misaligned with maps in Basecamp since upgrading to version 4.7.4 yesterday.

All my saved tracks are misaligned with maps in Basecamp since upgrading to version 4.7.4 yesterday.

Prior to that upgrade, all tracks showed correctly relative to the maps.

They now show approximately 50m to the west, and maybe 15m to the south of where they should be.

I did a test walk today and loaded the track into Basecamp, and the same thing occurred, so it is happening with new tracks as well as previously saved tracks.

I'm using Basecamp in Windows 10, and the test walk today was using a recently purchased Montana-700.

The misalignment is there regardless of which map I view the tracks on - Topo-active, GB OS 50K, GB OS25K, and regardless of whether GPS unit is connected to computer or not.

Any thoughts on how to resolve would be appreciated.

Is there any way to revert back to the previous version of Basecamp where everything worked as it should?