There are at least two scenarios in which Acrobat is busy, but provides no activity/notification of what it's doing or that it's busy:

1) With auto-updates enabled, Acrobat will download and install the update in the background. During the installation, the Acrobat application will not respond to clicks for 15 seconds - 2 minutes or so and no notification of what it's doing will show

2) When combining files, each time a file is added, Acrobat doesn't respond to clicks (it is apparently preparing the file in the background to be converted) until that processing is complete. This behavior occurs with each file added

Given that there is no notification (not even a spinning wheel) of being busy, I feel that some users will force close the application thinking that it has locked-up (non-responsive).

If some sort of notification/indicator of business can be added for each of these, I believe it would improve the product.

Thank you,