#1
A crack occurred near the saddle all the way to the hollow space. 

Is it okay to put on strings after this crack? 

Please advise. 


#3
I think he means bridge to soundhole, the bridge may be pulling up from over tuning, by all means do not string it, get it fixed.
#5
Depends on the crack.  None of us can give a good answer unless we know exactly where the crack is and how big it is.  A picture would help.
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