up arrow randomly stops working in x2go

Question

I have been using x2go for a while. I'm running ubuntu on client and server. On occasion, the up arrow just stops working on the remote desktop, even though it is still working on the client. I'm completely puzzled by this.

Here is the xev output for left, right, down, up:

left:

KeyRelease event, serial 36, synthetic NO, window 0x3600001,
    root 0xb7, subw 0x0, time 3738756369, (-172,430), root:(699,925),
    state 0x0, keycode 113 (keysym 0xff51, Left), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

right:

KeyPress event, serial 36, synthetic NO, window 0x3600001,
    root 0xb7, subw 0x0, time 3738757962, (-172,430), root:(699,925),
    state 0x0, keycode 114 (keysym 0xff53, Right), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
XFilterEvent returns: False

down:

KeyPress event, serial 36, synthetic NO, window 0x3600001,
    root 0xb7, subw 0x0, time 3738758877, (-172,430), root:(699,925),
    state 0x0, keycode 116 (keysym 0xff54, Down), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

up:

FocusOut event, serial 36, synthetic NO, window 0x3600001,
    mode NotifyGrab, detail NotifyAncestor

FocusIn event, serial 36, synthetic NO, window 0x3600001,
    mode NotifyUngrab, detail NotifyAncestor

KeymapNotify event, serial 36, synthetic NO, window 0x0,
    keys:  4294967223 0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   
           0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0 

Any ideas??? Thank you.