Default [Q] twrp v2.7.1.0 corrupting zips iorooted lg v50020b

Hey peeps,
had to register today as never not been able to find a solution by searching, first time for everything!

Not long had my lg g pad v500 came with 20b 4.4.2 installed.

i have rooted using the ioroot method mentioned within the g pad section on here and then installed twrp v 2.7.1.0.(apologies, got somany tabsup i cant find where i got the recovery iinstall from)

i am trying to install various roms - mainly the slimkat latest 4.4.4 build, But TWRP seems to be corrupting the roms on this version. I know its not the zip/roms and i have read that this version is no good for installs!

Just tried jumping back to 2.3.6.2 as mentioned in the post below but get errors! I'm normally a CWM guy but twrp seemed the better choice after reading some posts!
http://forum.xda-developers.com/show....php?t=2641409


Code:
Install Recovery...

3365 KB/s (358400 bytes in 0.104s)
3059 KB/s (72056 bytes in 0.023s)
3043 KB/s (11016192 bytes in 3.535s)

/dev/block/platform/msm_sdcc.1/by-name/aboot: cannot open for read: Permission d
enied
Unable to open /data/local/tmp/aboot.img: No such file or directory

[+] loki_patch v2.1
[-] Failed to open /data/local/tmp/aboot.img for reading.

[+] loki_flash v2.1
[-] Failed to open aboot for reading.

Reboot into recovery now [yes/no]?

any ideas/direction on how i can jump back to lower stable twrp versions?