Unable to mount USB device

[Dripple]

Hi,

since I upgraded to 5.10, I can not mount USB devices. Here is the 
message I get in KDE :
Un problème s'est produit lors du chargement de media:/sdb1 :
Le fichier ou le dossier media:/sdb1 n'existe pas.

(An error has occured while loadind media:/sdb1 :
File or folder media:/sdb1 does not exists.)

Any help ?

Here is /var/log/message tail when plugging key :

Oct 13 15:36:28 localhost kernel: [4295152.027000] usb 2-2: new full 
speed USB device using uhci_hcd and address 4
Oct 13 15:36:28 localhost kernel: [4295152.124000] scsi2 : SCSI 
emulation for USB Mass Storage devices
Oct 13 15:36:28 localhost usb.agent[9922]:      usb-storage: already loaded
Oct 13 15:36:33 localhost kernel: [4295157.130000]   Vendor: USB 
Model: BAR               Rev: 2.00
Oct 13 15:36:33 localhost kernel: [4295157.130000]   Type: 
Direct-Access                      ANSI SCSI revision: 02
Oct 13 15:36:33 localhost kernel: [4295157.250000] sdb: Unit Not Ready, 
sense:
Oct 13 15:36:33 localhost kernel: [4295157.251000] : Current: sense key: 
Unit Attention
Oct 13 15:36:33 localhost kernel: [4295157.251000]     Additional sense: 
Not ready to ready change, medium may have changed
Oct 13 15:36:33 localhost kernel: [4295157.253000] SCSI device sdb: 
511744 512-byte hdwr sectors (262 MB)
Oct 13 15:36:33 localhost kernel: [4295157.256000] sdb: Write Protect is off
Oct 13 15:36:33 localhost kernel: [4295157.271000] SCSI device sdb: 
511744 512-byte hdwr sectors (262 MB)
Oct 13 15:36:33 localhost kernel: [4295157.274000] sdb: Write Protect is off
Oct 13 15:36:33 localhost kernel: [4295157.275000] 
/dev/scsi/host2/bus0/target0/lun0: p1
Oct 13 15:36:33 localhost kernel: [4295157.284000] Attached scsi 
removable disk sdb at scsi2, channel 0, id 0, lun 0
Oct 13 15:36:33 localhost scsi.agent[9986]:      sd_mod: loaded 
sucessfully (for disk)


Thanks for any help.

Dripple