Ok, I reverted to previous behavior. The fix (to my surprise) turned out to simple. I have checked in a fix to github, but below is the required change so you can modify your netcdf-c directly. 1. edit the file libdap2/cache.c 2. locate the following two lines (about line 225). if((flags & NCF_PREFETCH_ALL) == 0) ce = buildconstraintstring(constraint); 3. remove the first line (the 'if') so that the second line is executed unconditionally. =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: TMR-458993 Department: Support netCDF Priority: Urgent Status: Closed