New type of RB260GS, latest firmware swos-css1061g4p1s-2.1.bin, default configuration.
Add random new ACL rule (can be even empty one), hit Apply All. Go to System tab, hit Save Backup button … and switch just hungs. No ping, no GUI, nothing, until power is removed.
Can anybody confirm that or is this my personal (browser related) issue?
really, 2 weeks, 73 views and, nobody don’t care about saving config?
I have hundreds on RB260’s, and how to hell I supposed to configure them all?
Hello Mikrotik … ?
Why not try with new, 2.2 version?
In changelog is written:
*) fixed problem where big ACL, VLAN or static hosts lists kept only couple of first entries;
*) made “Save Backup” work on CSS106;
At that time, when I posted my question, there was no newer firmware.
They probably read my post and made a new one in meantime. 
Okay, now it works. At least with Firefox and Chrome. IE 11 displays some gibberish to the screen, instead of saving it, but this is no big deal.
Thanks …