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the problem results from the "degree character" and will be fixed in the next update.
Until then, you can delete the "degree character" to save the point.

Sounds like you're trying to make a permanent change to a temporary geocache object, one brought in via Geocaching4Locus.  Right?

Try saving the object to a folder (effectively making it permanent), then modifying it.  Or simply switch completely to offline caching using PQs.