Thanks, I can reproduce it now. I assume that it is a problem in the language definition, but even if it is, it shouldn't crash the app. I'll try to find out what's happening.

Hello, thanks for your report.

Does this happen with any (i.e. even an empty) .go file? If not, can you send me a .go file that causes it to crash?

Does the recent file list help in this case? See http://www.textasticapp.com/v4/manual/lessons/How_can_I_show_a_list_of_recently_opened_files_How_can_I_close_the_current_file.html

This is the feature I'm currently working on and many things already work, but there's still a lot that needs to be done before I can release it.

You can add custom syntax definitions to Textastic by using TextMate bundles. See

http://www.textasticapp.com/v4/manual/lessons/How_can_I_add_my_own_syntax_definitions__themes_and_templates.html

A quick search for "typescript tmbundle" in Google brought up this TextMate bundle which should work:

https://github.com/stoffera/textmate-typescript 

(you need to replace the symbolic link at TypeScript.tmBundle/Syntaxes/typescript.tmLanguage with the actual file though...)

Does it work with another, maybe more simple file?

I just tried it out with local preview of local and iCloud files and it worked for me. You do need an internet connection that can connect to https://getfirebug.com/ for this feature to work.

I did exactly that.

In step 5, if I just tap on the "Done" button to dismiss the preview screen, the next time I still get the file "000.htm".

If instead I tap on the address bar and bring up the keyboard (maybe by accident) and then tap on the Done button (even without pressing any key on the keyboard), the next time it shows the "copyright.htm" file. Maybe that it was happened?

As I explained above, this is a feature, not a bug :) - if you make sure that you don't tap on the address bar, it shouldn't set a new preview file. To revert it, just tap on the address bar, tap on the "X" button on the right side of the address bar and press "Go" on the keyboard.

So, the address bar shows the wrong file? This hasn't occured on my device. Can you send me two example files where this happens?