Me too I can't reproduce the issue... could be something in the .NET Framework, or about plugins....
This is from my official SMath (development tools plugin)
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SMath Studio: SMath Studio Desktop 0.97.5189.3332, x64
OS: Microsoft Windows NT 6.1.7601 Service Pack 1 (Microsoft Windows 7 Home Premium , x64)
Screen: 1366x768 px, 96x96 dpi
Localization: separator=<comma>; decimal symbol=<period>; system decimal symbol=<period>; language=ENG
Frameworks: CLR 2.0.50727.5472
installed versions:
v2.0.50727 2.0.50727.5420 SP2
v3.0 3.0.30729.5420 SP2
v3.5 3.5.30729.5420 SP1
v4
Client 4.5.50938
Full 4.5.50938
v4.0
Client 4.0.0.0