[PyMOL] Strange behaviour with APBS

[Gilles T. <gil...@cg...>]

I have noticed a strange behaviour of the APBS module. I used it a lot 
recently and it works perfectly for 95% of the structures I analyzed. I 
usually fetch the pdb code, then remove waters, heteroatoms and so on. I 
also noticed that in some cases, when the b factor is quite big (over 
100) APBS cannot work the pdb file because it mixes up the b factor and 
the number which is just before (occupancy). But I managed with that, I 
usually erase the b factor to 0 before doing the APBS calculation and 
everything works fine then.
The other strange behavious is related to nothing I can pinpoint 
unfortunately. For some files (I always fetch them with the fetch 
command from Pymol), I can set the grid OK and when I launch APBS, I can 
see the file being processed (I see the select and hydrogens go on!) and 
then it stops with the following error message:

ObjectMapLoadDXFile-Error: Unable to open file!
ObjectMapLoadDXFile: Does 'pymol-generated.dx' exist?

All the paths for APBS are correctly setup, the temp files are setup as 
well.
If I then fetch a new file, APBS works, even for several files (one 
after another) and if I come back to the file I wanted to do first, it 
gives me the same error message (BTW, the pdb file is 1CJC).

Any help would be greatly appreciated!!!