Anyone ever use this faux-Excel App? I used it on the 84+SE a few times, but found it quite fiddly and didn't get into it much. Still, I downloaded the CSE version for the sake of completeness, and I think today is the first time I ran it. Then when I selected Quit from its menu, the calculator returned to normal except...
The following keys would not work: APPS, PRGM, all the top row of Graphing functions and their <2nd> uses, <2nd>-DRAW, and <2nd>-Mem. Interestingly, the <ALPHA>-F key shortcuts did still work, and I think pretty much everything else, but I had no access to graphing, programs, Apps, or the reset options in the Mem menu. I was thinking the reset button on the back might be my only option, but couldn't remember whether that would croak the Archive memory too, so planned first to connect to the PC and see if I could backup the program I was working on today, then reset. But by chance I found scrolling the Entry History a run command for the aforementioned program before the glitch occurred. So I could check whether it was still there! The program ran fine, and since part of its operation is to graph the function, I finally got to see my graph screen again. Even more remarkably, it seemed to heal all the ills in my calculator: the inactive buttons now work again!
I mention all this
* in case anyone knows why this would happen, or how to prevent it,
* to warn you that, so far as I can tell, it was CelSheet that caused it.
The following keys would not work: APPS, PRGM, all the top row of Graphing functions and their <2nd> uses, <2nd>-DRAW, and <2nd>-Mem. Interestingly, the <ALPHA>-F key shortcuts did still work, and I think pretty much everything else, but I had no access to graphing, programs, Apps, or the reset options in the Mem menu. I was thinking the reset button on the back might be my only option, but couldn't remember whether that would croak the Archive memory too, so planned first to connect to the PC and see if I could backup the program I was working on today, then reset. But by chance I found scrolling the Entry History a run command for the aforementioned program before the glitch occurred. So I could check whether it was still there! The program ran fine, and since part of its operation is to graph the function, I finally got to see my graph screen again. Even more remarkably, it seemed to heal all the ills in my calculator: the inactive buttons now work again!
I mention all this
* in case anyone knows why this would happen, or how to prevent it,
* to warn you that, so far as I can tell, it was CelSheet that caused it.