Livetracking Problem with Samsung S4 Active

For some time now I use Oruxmaps on my Samsung S4 Active.
Unfortunately livetracking to mapmytracks doesn't work and I
can't find out what causes the problem.
Livetracking to Gpsgate (via Oruxmaps) doesn't work too, so I suppose it is not
an Oruxmaps problem. There is not a difference whether I use
Oruxmaps v. 5.5.3 or an older beta version.
Did someone else encounter this problem?
Uli

I'm not sure why, but livetracking works now again.
I changed that old beta version to v 5.5.3 beta 12 and
now even version 5.5.3 activates livetracking.
I'm happy again :-)
Uli