What's up with the editing?

[Constance]

This just started today...every time I try to edit a post, all I get is the new part, and the rest is left out. It seems to be really screwed up.

Is anyone else having this problem?

 

[Robt]

I wrote and edited a post about 4 hrs ago and it went well, no problems.

 

[Swann]

I have had the same problem as Constance.