Right, so. Fixed the rounding calculations for armour mods, gear and some other stuff.
Calculations for the capacity increasing mods now works again properly; items that do this will need the <softweave /> bonus applied. I'm really not a fan of locking away things like that behind specifically named improvements, but there's a chunk of annoying work involved in genericising it for existing characters. One day or another I'm going to do something about a loading shim to manage characters with old improvements that won't cause issues, but that's probably a long way off.
As for the metamagic technique issue, I can't replicate it. At what point does it crash? Clicking the button to open the form, selecting a metamagic, accepting the selected metamagic, etc.? If it's crashing out, you're probably getting a prompt to send a notification to us. If you click No, what are the top five lines or so of the exception report?