Problem B) and C) only seems to happens when I try to put myself in two groups.

I also get this exception message now, when I login:

preshook ::namespace inscope ::Roster PresenceEvent failed: 1
bad modifier "88": must be above, ancestors, below, bottom, child, children, descendants, firstchild, lastchild, left, leftmost, next, nextsibling, parent, prev, prevsibling, right, rightmost, sibling, or top
    while executing
"$T item element configure $item cTree $elem -image $image"
    (procedure "SetAltImage" line 29)
    invoked from within
"SetAltImage $jid $key $value"
    (procedure "::RosterPlain::SetItemAlternative" line 5)
    invoked from within
"$plugin($name,setItemAlt) $jid $key image $value"
    (procedure "StyleConfigureAltImages" line 8)
    invoked from within
"StyleConfigureAltImages $jid"
    (procedure "::RosterTree::StyleCreateItem" line 6)
    invoked from within
"::RosterTree::StyleCreateItem $jid "available" -name buzz -groups {Coccinella Cacher} -subscription none -resource Coccinella@sre -type available"
    ("eval" body line 1)
    invoked from within
"eval {
		::RosterTree::StyleCreateItem $jid "available"
	    } $itemAttr [array get presA]"
    ("highest-prio" arm line 15)
    invoked from within
"switch -- $config(roster,multi-resources) {
	
	"highest-prio" {

	    # Add only the one with highest priority.
	    set jid2 [jlib::barejid $jid]
	  ..."
    (procedure "NewAvailableItem" line 11)
    invoked from within
"NewAvailableItem $rjid"
    (procedure "Presence" line 70)
    invoked from within
"Presence $jid3 $type -from <email address hidden>/Coccinella@sre -type available -resource Coccinella@sre -xmldata {presence {from sebastia@l00..."
    ("eval" body line 1)
    invoked from within
"eval {Presence $jid3 $type} $opts"
    (procedure "PresenceEvent" line 63)
    invoked from within
"PresenceEvent ::jlib::jlib1 {presence {from <email address hidden>/Coccinella@sre xml:lang en to <email address hidden>/Coccinella@sre} ..."
    (in namespace inscope "::Roster" script line 1)
    invoked from within
"::namespace inscope ::Roster PresenceEvent ::jlib::jlib1 {presence {from <email address hidden>/Coccinella@sre xml:lang en to sebastia@l00-bugd..."
    ("uplevel" body line 1)
    invoked from within
"uplevel #0 $func [list $jlibname $xmldata]"
bad modifier "88": must be above, ancestors, below, bottom, child, children, descendants, firstchild, lastchild, left, leftmost, next, nextsibling, parent, prev, prevsibling, right, rightmost, sibling, or top
    while executing
"$T item element configure $item cTree $elem -image $image"
    (procedure "SetAltImage" line 29)
    invoked from within
"SetAltImage $jid $key $value"
    (procedure "::RosterPlain::SetItemAlternative" line 5)
    invoked from within
"$plugin($name,setItemAlt) $jid $key image $value"
    (procedure "StyleConfigureAltImages" line 8)
    invoked from within
"StyleConfigureAltImages $jid"
    (procedure "::RosterTree::StyleCreateItem" line 6)
    invoked from within
"::RosterTree::StyleCreateItem $jid "available" -name buzz -groups {Coccinella Cacher} -subscription none -resource Coccinella@sre -type available"
    ("eval" body line 1)
    invoked from within
"eval {
		::RosterTree::StyleCreateItem $jid "available"
	    } $itemAttr [array get presA]"
    ("highest-prio" arm line 15)
    invoked from within
"switch -- $config(roster,multi-resources) {
	
	"highest-prio" {

	    # Add only the one with highest priority.
	    set jid2 [jlib::barejid $jid]
	  ..."
    (procedure "NewAvailableItem" line 11)
    invoked from within
"NewAvailableItem $rjid"
    (procedure "Presence" line 70)
    invoked from within
"Presence $jid3 $type -from <email address hidden>/Coccinella@sre -type available -resource Coccinella@sre -xmldata {presence {from sebastia@l00..."
    ("eval" body line 1)
    invoked from within
"eval {Presence $jid3 $type} $opts"
    (procedure "PresenceEvent" line 63)
    invoked from within
"PresenceEvent ::jlib::jlib1 {presence {from <email address hidden>/Coccinella@sre xml:lang en to <email address hidden>/Coccinella@sre} ..."
    (in namespace inscope "::Roster" script line 1)
    invoked from within
"::namespace inscope ::Roster PresenceEvent ::jlib::jlib1 {presence {from <email address hidden>/Coccinella@sre xml:lang en to sebastia@l00-bugd..."
    ("uplevel" body line 1)
    invoked from within
"uplevel #0 $func [list $jlibname $xmldata]"