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This problem may be caused by a limitation in Windows with path lengths. Windows unfortunately limits the maximum length to 255 characters (which includes the filename). Try saving the torrent to a location closer to the drive's root, such as C: orrent.
Simply create two blank files named "settings.dat" and "resume.dat" (without the quotes) in the same folder utorrent.exe is saved in. Make sure Windows is not hiding the file extension when creating the file (in Explorer, Tools -> Folder Options -> View, uncheck "Hide extensions for known file types", hit OK)
This is an anti-leech protection put in µTorrent. It means your upload cap is set too low, and as such, your download is limited to 6 times that amount (3 in 1.4 build 402, 6 in 1.4.1 build 405+). It's set to 6 times the cap so that legitimate users who need that cap (dial-up, ISDN, certain slow broadband connections) are unaffected by it. It only applies to upload caps of 1-5 KiB/s.
This means that the disk was not able to keep up with the read/write speed. To fix this, you can change the options in Disk Cache.
However, if this happens when adding a torrent, it is normal, and due to a design limitation in µTorrent, which will be fixed in the future, not because your disk is actually overloaded. It will disappear after a few minutes.
This error means that µTorrent was unable to map the port with UPnP. If you have a green status light or have forwarded your port manually, you can safely ignore this error. However, if you have a yellow/red status light, it may mean that you need to forward the port manually, or that your firewall is blocking incoming connections. UPnP will currently only work on Windows XP in 1.5, so other OSes will need to forward manually. However, 1.5.1 beta 462 and later support UPnP on ALL OSes.
This means that µTorrent was unable to add itself as an exception to the Windows Firewall, using the standard Windows Firewall API. This most likely means that the firewall is disabled or not present. You can safely ignore this error. However, if you have another software firewall, you will still need to manually configure it to allow incoming and outgoing connections.
This only happens on FAT32 drives, due to a limitation with FAT32. Files greater than 4GB cannot be created on FAT32 partitions. The only fix is to convert the drive to NTFS, or use another drive that is already NTFS.
To convert a drive to NTFS, click Start -> Run -> cmd, then type convert X: /FS:NTFS, X being the drive's letter you want to convert.
Please see this question.
Please see this question.
Please see this question.
This is generally caused by having bt.compact_allocation on. Please turn it off, this option is not fully working. Use diskio.sparse_files (NTFS only) instead if you want to save space while downloading.
This can also happen if you remove/rename files from a torrent. Re-add/rename the files, or force a re-check.
This bug is currently being looked into. There is no workaround apart from not using selective downloading on these OSes, but the error should not happen again if you simply start the torrent again.
This is not a µTorrent error, but instead an error reported by your hard drive. It means that your HDD was unable to read or write the data because the sectors are faulty or starting to die, which may be a sign of future disk corruption. Running chkdsk might help, but you may need stronger recovery tools (such as SpinRite).