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You can download Textastic 5 from the Purchased tab on the App Store (or Updates -> Purchased on iPhone). See this article for details: https://support.apple.com/en-us/HT201272
This issue is probably related to a password lock bug I fixed. I'll look into it.
That font looks very interesting. I'll try it.
Can you give me some more details on how to reproduce this issue? Are you using an external keyboard?
It's easy to add custom .tmTheme files to Textastic. Please have a look at this entry in the manual: http://www.textasticapp.com/v6/manual/lessons/How_can_I_add_my_own_syntax_definitions__themes_and_templates.html
You can sign up for the Textastic 6 beta at http://goo.gl/forms/piRaSmBzmM. It has full support for the iPad Pro and split view multitasking.
Customer support service by UserEcho
If Apple supported proper update pricing, I would have loved to use that.