I’ve had a couple of reports about Yummy crashing when you try to enter an Instapaper password. The good news is that I have found the problem and am just testing a fix before submitting it to Apple.
The bad news is that this is likely to affect everyone who has a password set on their Instapaper account. A quick workaround is to temporarily remove the password from your Instapaper account.
My apologies to everyone who is affected by this bug.