I have had this happen a few times in the last week and I don't know why it's happening or what to do to prevent it.
I use pop-up and modal forms a lot for report filtering, etc. and lately whenever I make a change to one of the forms it no longer opens up (or if it does it's hidden somewhere). If I take the pop-up and modal attribute off, the form opens fine.
I am developing in a 2010 environment and saving the app as a 2007 for use by my clients at their end. Could this have something to do with it?
Thanks for any help...