Can't send attachments in mail since upgrading

Question

Hi-
Since upgrading, I can't send attachements in Mail.  The filenames appear all grayed out and they can't be highlighted.  In order to attach, I have to open through Finder and drag over into Mail. 
What gives?
s

Answer 1

Usability and interface issues with Gmail aside, I did figure something out. (I don't really use Gmail, it just seemed like a good at the time when I was setting up an account for a friend so I could help out with issues.)
I couldn't add attachments to a new message either. In fact, when I clicked the link to add an attachment, the link disappeared. I discarded the message, opened a new one, click the add attachment link, and the link disappeared again.
Turning off the blocking of pop-up windows didn't change the outcome.
So I opened a new message and looked around.
I noticed a little icon in the upper right of the message, just above the To: field, a sort of double square with an arrow in it. It looked almost like icon used on Windows to indicate maximizing the window for full screen, except it had an arrow that looked like the "Forward" arrow when you want to forward a message instead of replying. No tool tip came up so I decided to try it.
This made the message disappear, and popped open a new smaller window which eventually loaded the message. Looked about the same as before but without the rest of Gmail. Curiously, the add attachments link actually worked, without disappearing. A dialog popped open (looked like from the OS, not a browser window) and I was able to select a file. It appeared listed below the subject and above the message, with a progress indicator that took several seconds (half a minute?) before any progress happened. It did eventually get started and completed the upload.