Error when assign material

Hy,

when I assign a material from the usermateriallibrary i get different Errors!?

Unbehandelte Ausnahme aufgetreten:EXCEPTION_ACCESS_VIOLATION (code: 0xC0000005)
0# 0x00007FF87A99F5A9 in VisualComponents_Revolution
1# 0x00007FF86BAA038E
2# 0x00007FF866052E2F
3# 0x00007FF8C4DB222E in clr
4# 0x00007FF8658BA7CE
5# 0x00007FF8C4DB222E in clr
6# enableCppUnhandledExceptionDispatcher in VisualComponents_Revolution
7# _chkstk in ntdll
8# RtlRaiseException in ntdll
9# KiUserExceptionDispatcher in ntdll
10# rDsgTraverser::GeosetTestTypePriority in Revolution
11# rDsgTraverser::GeosetPickedAtRadius in Revolution
12# 0x00007FF8694ED851
13# 0x00007FF8694ECF0A
14# 0x00007FF8694EBAD2
15# 0x00007FF8694EB785
16# 0x00007FF8694EB030
17# 0x00007FF8694EAF28
18# 0x00007FF8694EADA7
19# 0x00007FF87DA91A35 in PresentationCore_ni
20# 0x00007FF87DA92EEF in PresentationCore_ni
21# 0x00007FF87DECD577 in PresentationCore_ni
22# 0x00007FF87D53684E in PresentationCore_ni
23# 0x00007FF87DA92DAE in PresentationCore_ni
24# 0x00007FF87D528B0F in PresentationCore_ni
25# 0x00007FF87D543336 in PresentationCore_ni
26# 0x00007FF87D542852 in PresentationCore_ni
27# 0x00007FF87D524058 in PresentationCore_ni
28# 0x00007FF87DA96CCD in PresentationCore_ni
29# 0x00007FF8694E883D
30# 0x00007FF8694E7F78
31# 0x00007FF87D528B0F in PresentationCore_ni
32# 0x00007FF87D543336 in PresentationCore_ni
33# 0x00007FF87D542852 in PresentationCore_ni
34# 0x00007FF87D524058 in PresentationCore_ni
35# 0x00007FF87D51CA9C in PresentationCore_ni
36# 0x00007FF87D52DA7B in PresentationCore_ni
37# 0x00007FF87D52D58B in PresentationCore_ni
38# 0x00007FF87D555B32 in PresentationCore_ni
39# 0x00007FF87D57D1CB in PresentationCore_ni
40# 0x00007FF87D53AC0D in PresentationCore_ni
41# 0x00007FF87D53A3AF in PresentationCore_ni
42# 0x00007FF885E23314 in WindowsBase_ni
43# 0x00007FF885E23714 in WindowsBase_ni
44# 0x00007FF885E23D58 in WindowsBase_ni
45# 0x00007FF885E23C56 in WindowsBase_ni
46# 0x00007FF885E21262 in WindowsBase_ni
47# 0x00007FF885E23082 in WindowsBase_ni
48# 0x00007FF885FE3B82 in WindowsBase_ni
49# 0x00007FF8C4DB222E in clr
50# CallWindowProcW in USER32
51# DispatchMessageW in USER32
52# 0x00007FF885E44479 in WindowsBase_ni
53# 0x00007FF885E1EDF5 in WindowsBase_ni
54# 0x00007FF87BF61421 in PresentationFramework_ni
55# 0x00007FF87BF60E5C in PresentationFramework_ni
56# 0x00007FF8658608D1
57# LogHelp_TerminateOnAssert in clr
58# LogHelp_TerminateOnAssert in clr
59# LogHelp_TerminateOnAssert in clr
60# SetRuntimeInfo in clr
61# SetRuntimeInfo in clr
62# SetRuntimeInfo in clr
63# SetRuntimeInfo in clr
64# SetRuntimeInfo in clr
65# CorExeMain in clr
66# CorExeMain in mscoreei
67# CorExeMain in MSCOREE
68# BaseThreadInitThunk in KERNEL32
69# RtlUserThreadStart in ntdll

Regards
Feature