"save as" pop up box does not allow me to save the document.

Solve my problem with this answer thank you very much.

Thank you. It worked.

Worked for me, brilliant, been puzzling me for a while. Much appreciated. Good luck to anyone still having issues with this.

thanks a lot

worked for me as well recently dropped. Wasted time trying to figure this out. I am still having issues because I cant print anything. This is ridicules as I am trying to make project deadlines.

That worked for me too! Thanks

Thanks much - this fixed my issue too!!

Ok, I opened a document and from there was able to find Preferences.  I made the change recommended and I am now able to save documents.  Still don't understand why Adobe would allow this to remain such a secret.  Thank you to the 'richil' for the solution.

I'm getting very frustrated with Adobe.  I've ALWAYS been able to do a Save As and select a file/name, or I've been able to click Print then select PDF, but nothing is working.  The answer above referencing Preferences - I cannot find Preferences anywhere, and when I try to google it I get so many hundreds of questions about what exactly.  I'm thinking of completely uninstalling Adobe and trying to start from scratch.  This problem cropped up recently, I think, during some kind of upgrade that I wish I had not done.  I can't even find a phone number so I can call and talk to a human.  I'm really beginning to HATE Adobe.

Excellent! It worked.

But it's strange that this problem began today from nowhere...