Tech Problem-Indicators not showing in Navigator

HI, this might not be the right Forum for this, but I'm hoping someone knows the fix...
I install new Indicators, and they Compile OK. No errors. But they will not show in the Navigator? I've retried compiling, Logging off, back on, etc????
al

Maybe you put them in the wrong folder. The only correct place for indicators is experts/indicators

For example:
C:/MetaTrader/experts/indicators

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mt4 has a limit on the number of indicators it will show in the navigator window. Do you have a large number of indicators??

are you using Vista?

delete file name with the *.dat extension from indicators folder & restart mt4!

What's the limit and why?