yum errors in F7 after upgrade from FC5

[lintolis]

Dear all
after upgrading from FC5 to F7 several errors in yum started
1s of all after the upgrade i received errors regarding cannot read/write pidgin.repo related...
I checked here and found some similar issues and now that i came home to try their solutions i find an other error when i run yum update
"
yum update
Loading "installonlyn" plugin
Setting up Update Process
primary.sqlite.bz2 100% |=========================| 3.8 MB 07:00
http://ftp.cc.uoc.gr/pub/fedora/linu...ry.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
primary.sqlite.bz2 100% |=========================| 3.8 MB 00:58
ftp://ftp.ceid.upatras.gr/pub/fedora...ry.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
primary.sqlite.bz2 100% |=========================| 3.8 MB 01:24
http://ftp.ntua.gr/pub/linux/fedora/...ry.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
primary.sqlite.bz2 100% |=========================| 3.8 MB 01:23
ftp://ftp.otenet.gr/pub/linux/fedora...ry.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
Error: failure: repodata/primary.sqlite.bz2 from fedora: [Errno 256] No more mirrors to try.


"
Any clues???? these mirrors are the best or at least the availables in greece. Could something happen to all 4of them at the same time?
thanks
tolis

[FriedChips]

tried

yum clean all

?

[lintolis]

Well sometimes magick happens .... After reading this forum i tried to go and try some workarounds but when i tried to yum update everything worked great with no mistakes....
Don't knpw how all i know is that i only disable pidgin.repo and everything worked like charm...
Thanks anyway