Very recently I observed catalog problems similar to a problem reported Jan 22, 2017 .
Contrary to the advice given there, they could not be resolved by lowering
the star magnitute:
(1) Some catalogs (e.g. Tycho2) give proper results at times, but sometimes the following error
message appears: Error.ReferenceError: TITLE not defined.
(2) Using PPMXL and the parameters shown in the appended jpg, I either get the above error message
or an image with no stars in the four corners. Effect could not be influenced by changing the maximum magnitude.
(3) When using the Gaia2 catalog, I either get an image with stars in the lower right corner only, or I get completely
empty images. Process console: No stars painted.
Peter.