Symptom: Print Center says your document is printing, but nothing is happening.
If you have a printer supported by X that prints sometimes but not at others, it may be that you have too many applications open, thus preventing Print Center from getting the RAM it needs. I've discovered that X (any build) doesn't provide an error message saying "there is not enough memory for this task" (or some such).
Like many others, I've gotten in the habit of leaving my frequently-used apps open all the time, and with 617 Mgs of RAM, I thought I had plenty of memory to spare.
But on trying to print some docs, the Print Center would open and say the doc was printing (no error message) when in fact nothing was happening. When I tested with a one-word doc ("testing") it would print fine.
I quit several other apps, and now my more complicated doc printed just fine.
So if suddenly your printer is unresponsive, try again with fewer applications open in the background!
Impish
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Mac OS X Hints
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