calculator crashes on windows 7 64bit

[Former user]

Originally reported on Google Code with ID 353 ``` What steps will reproduce the problem? 1. run the calculator on windows 7 64bit 2. click on the view Constants/Function/Mathbook/Variables/History 3. Application crashes.

What is the expected output? view the Constant list

What do you see instead? Application Crashes

What version of the product are you using? On what operating system? ver: 0.10.1 os: windows 7 64 bit

Please provide any additional information below.

```

Reported by `swaminathan.karthikeyan` on 2010-08-01 17:58:48

[Former user]

Reported by `helder.pereira.correia` on 2010-08-02 02:49:09 - Status changed: `Duplicate` - Merged into: #196