Browser issues will only affect the behavior of your solution if you are using either a Web Browser or interactive container field (Say to view a multiple page PDF).
Windows 7 should work just find. It's what we have set up on all our office clients. And a file created in Windows generally works just find on a mac and vice versa. There are only a few issues that crop up due to differences in operatingsystems
You'll need to describe the design of these "forms" that are causing trouble in order for anyone to have a chance at helping you. If you cannot describe the design of them then you'll need to find a developer in your area to take a look at the design.
Perhaps it is a font size issue and you have something that cannot be seen once entered. If you click back in the field, do you then see something?
Sent from miPhone
Do you use WebDirect, or your "form" is made with web viewer ?
Thank you all for your replies! I will try to get more technical information.
I'm definitely not using a web browser directly, and I'm not using WebDirect. It's the pop-up windows that seem to be the problem, not the "main" forms--they're different than the others, but I don't know why. I will try to find out.