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

https://github.com/Shopify/liquid-tmbundle

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.

Two days ago, an Apple certificate that is used to sign Mac App Store apps expired. This may require a login to the Mac App Store, so that a new receipt is generated that is signed with a new certificate. This should happen only once per machine.