Dear Bennett,
(Sorry, this is not in sequence, I couldnt evade accusations of 'top posting'
I have had the same problem with Lyx 1.5..2 on an Intel macbook.
I didn't have this problem with the earlier 1.5
When I open most of the help documents I get:
No information for converting xpm format files to png.
Define a converter in the preferences.
When I really needed something a while back,
I got rid of some diagrams or images in the help
document in question, and then it worked.
It is an obnoxious error, since you have to do a
forced quit of LyX get out.
UPDATE... WHILE I WAS GOING THROUGH THE FILES
JUST NOW TO SEE WHICH WORKED, THE PROBLEM
CORRECTED ITSELF; strange it's been there for weeks,
but it hasnt made a problem for me, since I dont
need the converters.
I didnt do anything just now but open the files in
sequence, press DVI or PDF, get error, force LyX to
quit, and then go on to the next one; then suddenly
it worked with one it shouldn't have worked with;
now it works with all.
best, Michael