Upgraded to 2.8.1 and experiencing issues

This is my first time posting to this forum, so I apologize if this thread is in the wrong category.

I upgraded to 2.8.1 last week and immediately ran into some hiccups:

First, when I schedule my posts out, they never actually go live. It’s as if everything runs through it’s course and then at the last second it “Misses Schedule.” I’ve tried running a few tests here and there, but every time it’s the same thing. It’s frustrating because I rely heavily on scheduling my posts out.

Second, while editing or creating posts, there doesn’t seem to be a difference between the “Visual” tab and “HTML” tab. When I start typing… nothing shows up at all. My text won’t show up until I’ve repeatedly clicked between the Visual and HTML tabs. Then, no matter which tab I’m on, all I see is code.

Third, before I updated, I was able to insert photos and then re-size them by dragging their corners until I reached my desired size (something I really got used to and loved). I’m no longer able to do this when I insert photos.

I’ve wondered if, perhaps, my theme is simply not compatible with the newest version? That might explain some of the issues I’ve had with editing, but would it explain my problems with scheduling out my posts?

I believe that is everything and I hope I made sense. I admit, I’m a total amateur when it comes to code, CSS, and WordPress… so I will greatly appreciate some help in resolving these issues.

Thanks