Cannot update to new beta OS

Wow: just turned JF back on my machine, fine.

PS C:\Users\szlevi> netsh interface ipv4 set subinterface "PHY1" mtu=9000 store=persistent
Ok.

PS C:\Users\szlevi> netsh interface ipv4 show subinterfaces

   MTU  MediaSenseState   Bytes In  Bytes Out  Interface
------  ---------------  ---------  ---------  -------------
4294967295                1          0     157337  Loopback Pseudo-Interface 1
  9000                1     568342    4328812  PHY1
  1500                1          0    4067853  VMware Network Adapter VMnet1
  1500                1          0    4069319  VMware Network Adapter VMnet8

Then I went to see if the Cacti installation that was spinning frozen in the browser has actually finished but it (Cacti) only opened an empty page...

...then I tried updating NASinfo which also became unresponsive so I reloaded the UI, went back and a popup told me the Nasmon update checksum was invalid so it's aborted.

And Frontview did not load at all anymore. Interesting; let's see in Firefox 10 instead of Chrome v18.5... of course it works. I hate Chrome's unreliable nature. :(
Guess what: Nasmon et al updated itself just fine and it even works fine (sans loadavg spitting out php errors but who cares, I only need NASinfo and maybe phpsysinfo.)

Cacti craps out, removed.

However now I cannot upload any file nor even copy files over CIFS to share.

Does this thing (Dell 2816 switch, that is) actually support proper 9k frames? It does not look like that...