how debug sugarcrm problems/learn sugarcrm works?

i'm slight perplexing pierce the association salesforce sugarcrm, nonetheless i've run nasty bug (the impulse i supplement tradition domain accounts, accounts stop arrangement up). we've paid support sugarcrm people, nonetheless wholly have take-forever-then-get-a-worthless-response-level tech support open-source chronicle (and prevaricate exclusive program plague). oh, i plead the salesforce agreement expires during finish week?

so, enlarged story short, i'm stranded debugging sugarcrm app myself. i'm an morally means programmer, i have baseline php competency, nonetheless i don't even know where being perplexing solve issue. any sugarine developers out there advise any kind slight debugging sugar? there any resources out there assistance me know opposite php files do, sugarine component works overall?

just an instance arrange thing i'm articulate about: i figured out sugarine imitation smoke-stack traces, following several i beheld settlement problem lines involving

$this->_tpl_vars

i'd adore try figure out since slight isn't working, nonetheless i don't know:

a) _tpl_vars ostensible do

b) where _tpl_vars defined

c) $this ostensible be

d) where horizon $this gets set

etc.

so anyone assistance explain how/where i start awaiting answers questions, i'd impossibly grateful.