Not fixed here. Re imaged hard drive before installing, so no traces of any of old versions interefered. Now installed Version: 4.2.4.2 (Build ID: 63150712c6d317d27ce2db16eb94c2f3d7b699f). Here are results:

I auto-corrected the word [isnt] in lower case (within a sentence) to be [isn’t]. I also auto-corrected it at the beginning of a sentence, so [Isnt] becomes [Isn’t]. Now to type something:

There isn’t any way that by now there should be such an easily fixed bug within the program, but there still is. isn’t it a shame that it is still not working right, since I just started this sentence by typing [isnt] and it auto-corrected by adding the apostrophe but didn’t capitalize the word. isn’t it ever going to be fixed?

I'll try another, that I set up in advance, using the word [didn’t]. I left out all the apostrophes as I type and see what happens:

I didn’t do my homework last night. I didn’t know it was due today, did you? didn’t you do yours, either? We didn’t have time because we went to the ball game. didn’t we at least have a good time? isn’t it a shame we are going to be in trouble? didn’t this happen once before when we didn’t do our work?

Again, not getting auto-corrected spelling AND capitalization.

I typed the same paragraph in Word, and all was fixed as I went along:

I didn’t do my homework last night. I didn’t know it was due today, did you? Didn’t you do yours either? We didn’t have time because we went to the ball game. Didn’t we at least have a good time? Isn’t it a shame we are going to be in trouble? Didn’t this happen once before when we didn’t do our work?