a couple of things:
i just found that if a file pathname has a directory named with a leading $, PI seems to want to interpret this as a variable of some kind, so i can not open such a file by dragging the file from the finder to the PI desktop - a file not found error is generated, presumably because the $<dir_name> evaluates to nil, and so the pathname for the file is not correct. opening the file from the native Open File dialog does work, however.
the second is that i'm having trouble with spotlight on AFP-mounted NAS volumes again - trying to search for files using the native Open File dialog from within PI yields no matches if the directory being searched is on an AFP mount.
in the past this problem seemed to be caused by the lack of spotlight metadata for .fits files, and was rectified by installing the Observatory Pro finder plugin which provides native .fits/.xisf support to OSX. however, i just noticed though that on the latest released version of PI, i can not search for any .fits files that are contained on an AFP volume. the finder can successfully find them, so it feels like this problem is somehow different than before.
thanks,
rob