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When you log in to Tonido's web interface, all Tonido applications except TonidoPlug Admin are disabled.
There are three four possible causes:
(1) The TonidoPlug's internal storage space is very limited. Unless you attach an external storage device, your Tonido applications will run out of space. To fix this, simply connect a storage device and then restart the TonidoPlug by unplugging it and plugging it back in.
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(3) See Step 6 of Installation, First Steps
(4) Disable power saving mode on your hard drive