Photoshop will only do 1 Content Aware Fill for each visit and other quirky things

Photoshop will 'content aware fill' an object in photograph after I circle object with lasso tool.  It will not do a second object.  The lasso tool will mark it but the brush will not designate areas to be used for replacement.  Also, I have to designate areas to be used for the replacement by painting with the green 'paint' even though tutorials show Photoshop covering areas automatically.  It used to do that for me.  I may have clicked the wrong button unknowingly.

The sky replacement feature is often excellent but sometimes not.  In one case it installed a bush or tree on the horizon on the left edge.  The bush was not from my photograph.  Another occasion it left the original sky mostly intact but left what looked like sky that was compressed into a 1" wide verticle 'ribbon' that actually didn't look like anything but a mess.  On another occasion I used the healing brush to remove a lens flare toward the bottom of the picture then did the sky replacement.  When the new sky appeared the lens flare previously removed reappeared but it was in a square frame and basically white.  It would not respond to anything I tried until I removed the sky replacement then it disappeared.  On another occasion I deleted the sky replacement, went to the next couple pictures then went back and the sky replacement worked good.

The Mac OS and Photoshop are both up to date.  In case it matters, Topaz Sharpen, DeNoise and Gigapixel were all installed about a month ago.  I don't believe these problems just described have been happening the entire time since Topaz was installed but it has been happening for awhile.  Thanks for any help you can provide.