Please let me know the exact dot version of Acrobat DC & Operating System installed on your Mac?
Make sure Acrobat DC is updated to the latest version Release Notes | Adobe Acrobat, Reader.
For Save As issue, try the below troubleshooting steps :-
The default "Save As" dialog in Acrobat DC is different than the dialog that you've had in earlier releases of Acrobat, it also allows you to save to the cloud and previous locations you've saved files to. It is possible that when Acrobat tries to connect to "the cloud", it runs into problems. You may want to try to turn this feature off to see if that brings your save as dialog back: Open up Acrobat's preferences, then go to the "General" category and deselect "Show online storage when saving files":
Your suggestion worked perfectly. I deselected as instructed and it appears to work perfectly now. Thank you very much for your help!
I appear to have a larger problem than I had originally thought. Many of the dialogue boxes don't display property. The version of Adobe Acrobat Pro DC is 2015.010.20056. I have moved from a trial to the full version now. My mac information is Mac OS X Yosemite Version 10.10.5.
An example from today: I received the email about dropbox that went to many users. I went to "Home" and under 'Storage' clicked "Add Account" to try and link my dropbox account. The section to the right that should display the dropbox logo and "add" is blank.
I had a similar issue with the signature/tracking feature. It works great if I login to the cloud version. I sent a test document for a signature and it worked properly. The dialogue boxes on my desktop appears to be the only problem.