My problems were:
I was running most of my apps from SD card, but was still getting the low memory errors.
Then my phone crashed, SD card corrupted, couldn't access most of the apps
So, used Recover My Files on PC to recover what I could of the SD card(recovering a 32gb card takes fooking hours!!), then reformatted the card and transferred the recovered data back on to the SD card. That resulted in most, but not all, of my apps and data working again.
However, the low memory errors/storage errors/packet errors still persisted.
Thanks to a suggestion by Matroid on this thread:http://androidforums.com/t-mobile-mytouch-4g/278837-low-space-system-data-huge.html
I used Diskusage to examine my \data\system data folder and found a log folder using over 800mb!
Using Root Explorer, navigated to the folder, deleted the content, rebooted the phone, and all is now good!
At least for the moment anyway!
Hope this helps some other people out with similar errors, but using Diskusage to view the \data\system is worth checking out!
- System memory low errors
- Insufficient storage errors with updates
- Invalid package errors with updates
- All of the above I presume led to a major phone crash which corrupted my 32gb sd card
I was running most of my apps from SD card, but was still getting the low memory errors.

Then my phone crashed, SD card corrupted, couldn't access most of the apps

So, used Recover My Files on PC to recover what I could of the SD card(recovering a 32gb card takes fooking hours!!), then reformatted the card and transferred the recovered data back on to the SD card. That resulted in most, but not all, of my apps and data working again.
However, the low memory errors/storage errors/packet errors still persisted.

Thanks to a suggestion by Matroid on this thread:http://androidforums.com/t-mobile-mytouch-4g/278837-low-space-system-data-huge.html
I used Diskusage to examine my \data\system data folder and found a log folder using over 800mb!
Using Root Explorer, navigated to the folder, deleted the content, rebooted the phone, and all is now good!

At least for the moment anyway!
Hope this helps some other people out with similar errors, but using Diskusage to view the \data\system is worth checking out!