I tried searching for this issue but couldn't find it anywhere.
Just trying out the release candidate and noticed that if you start editing an object then take a snap shot with Fullscreen preview turned on then the tools window vanishes but you can still select objects around you, to stop selecting things you must re-open the tools window and close it again.
I looked at the effects on some other windows such as the inventory and communication windows and nothing happens to them.
Repro:
Edit an object or click the build button so the tools windows opens.
File > Take Snapshot
Make sure the Freeze Frame (Fullscreen preview) check box is checked.
Close the snapshot window or uncheck the Fullscreen preview check box so the snapshot effect stops.
See how the tools window is no more.
Second Life 1.21.0 (95368) Aug 28 2008 18:27:35 (Second Life Public Nightly)
Release Notes
You are at 147328.0, 236927.9, 24.1 in Ciel located at sim8259.agni.lindenlab.com (8.10.150.72:12035)
Second Life Server 1.24.3.95195
Release Notes
CPU: Intel Core 2 Series Processor (2327 MHz)
Memory: 2048 MB
OS Version: Microsoft Windows XP Service Pack 2 (Build 2600)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: Quadro FX 1500M/PCI/SSE2
OpenGL Version: 2.1.1
libcurl Version: libcurl/7.16.4 OpenSSL/0.9.7c zlib/1.2.3
J2C Decoder Version: KDU
LLMozLib Version: [LLMediaImplLLMozLib] - 2.01.17729 (Mozilla GRE version 1.8.1.13_0000000000)
Packets Lost: 0/9278 (0.0%)