Your comments

Is there any chance you can send me the problematic file by email?
Currently, Textastic only supports monospaced fonts and assumes that all characters have the same width. This is not the case for MS Sans Serif which is a proportional font.

Also, unfortunately, Thai is a very complex script with complex Unicode properties (for example, several indivdual unicode characters can be displayed as one) and this is not supported in the current version of Textastic. I'm currently working on Textastic 3.0 and I might support Thai in that version. This largely depends on if I can make this perform fast enough.
Do you get an error message from ForkLift?
I'll try to reproduce the problem. Thanks for the detailed description!
As a workaround you could show the navigation wheel by tapping on the editor with two fingers and move the cursor one character to the right and then tap backspace/delete backward.
This shouldn't happen. Do you have any idea when exactly it behaves like that?

Currently, settings like this get lost when you copy or move a file. Maybe that's what happened to you?

Yes, I have already filed a bug with Apple. I don't know yet why this happens, but I'm actively investigating it. It only happens in the beta and it worked fine in iOS 3.2 and 4.

Thanks for your detailed report!

Hi Aaron,

the password is stored securely in the keychain. Unfortunately, the keychain values are not deleted when the app is deleted from the device. So in the current version of Textastic, there is no way to reset the password. Deleting and reinstalling the app won't work.

This really was an oversight on my part. So, to solve this problem, I plan to release an update for Textastic that detects when the app was started the first time after an uninstall and removes the password in that case. This doesn't make it less secure because all data like connection settings and files will be deleted when you delete the app so there is actually nothing to protect.

If you send me the device id of your iPad, I can provide you with a beta version of Textastic that does what I just described.

I'm really sorry for the inconvenience.