The debug log is saved in the "logs" directory in Textastic.

Hello, the "Open In" menu is provided by iOS and shows the apps that register itself with the system as being able to open certain files. 

You might want to contact the Python for iOS support team so they register their app for this feature.

According to the crash logs, the problem was that the app failed to resume in time.

Did you leave the app while it was downloading the files?

The default format that is used by Textastic is UTF-8. As far as I know NSUTF8StringEncoding  doesn't use a Byte Order Mark.

Also, on which iOS version are you? A crash report might help, too. See http://feedback.textasticapp.com/topic/48133-how-do-i-send-crash-reports/

Can you please tell me the exact order of keystrokes? An example would be nice so I can try to reproduce it here.

I'll have a look at the crash logs you sent.

This is the standard password entry behavior on iOS, so I can't change this, sorry.

This should be fixed. Are you using the latest version? (4.1) 

Did you use a Wi-fi connection at Starbucks or a cellular connection? Maybe they have a firewall in place?

Enabling the "Debug Log" setting in the connection's settings might help to find out what's going on.