I have a donation form setup with radio buttons with amounts and other option.
Other option shows the "Other Amount" product field when selected.
If I enter and amount in this field, and submit, it doesn't send to paypal, just goes directly to the thank you page. If I select a radio amount is goes to paypal.
I downgraded to version 1.6.2 and this problem goes away. This is an issue with the 1.6.3 update....doesn't seem to be picking up the "Other Amount" value, thus doens't submit to paypal feed.