Problem with DEM-Assissted Coregisteration step (Cosmo Sky-Med)

Microwave Toolbox Problem Reports
#1

I am trying to generate the velocity map using the Offset tracking tool on a pair of Cosmo Sky-Med data (Stripmap mode/SLC) but in the output of the DEM-Assissted Coregisteration (using SRTM) there are many gaps on the result (see attachment), in turns, then the output of Offset tracking is block. This happened for both the whole image and subset, and I also converted SLC to GRD mode and repeat the Coregistration again but I faced the same problem.
When I open the coregistered-result SNAP in the SARscape it seems Ok (see attachment)!
I use SNAP 5.

Thanks for your consideration.

SNAP.jpg1365×717 259 KB
SARscape.jpg1363×742 275 KB

#2

what is the software version? an error happen then the SCS cosmoskymed data was imported when the version 5.0.8 and 6.0 beta was used.