Thanks for your help.

You are correct- the mirror pops up, the shutter opens, but then the second curtain doesn't fire, so the shutter stays open.

The problem is the same with or without a lens. The only time that the shutter cycle is completed is when there are no batteries (it fires at 125) or I set it to 125, or when I have it on AUTO and point it at a bright light, like you suggested (but this last situation only works orrectly sometimes.)

The battery is the correct voltage.

Does this mean that there is a probelm with the meter?

I recently bought an mes, and am experiencing shutter problems.

Without batteries, the sutter seems to work fine. When I put batteries in and press the shutter button, the mirror gets stuck up, and the second curtain doesn't always drop. If I move the dial off of "auto," the cycle completes itself and everything is back to normal.

Otherwise the light meter seems to work fine, it has new foam, and seems pretty clean.

Anyone have an idea as to why the mirror is locking up?