ContributionsMost RecentMost LikesSolutionsRe: TestComplete 9, Checkpoint wizard got "A new guard page for the stack cannot be created."My windows app develops using C# .net framework 4.0 on vs2017 S.PiensTestComplete 9, Checkpoint wizard got "A new guard page for the stack cannot be created." I'm using TestComplete 9.20.02460.7 Windows 7 sp 1, cpu intel Core i7 ram 8GB I have a problem while using Checkpoint function on TestComplete 9 when I select any control such as DataGridView, TreeView, Ribbon menu, Scrollable control etc. (but did not happen all controls) I got error message "A new guard page for the stack cannot be created." and my application will terminate. (see more on attach clip) I tested with version 12 (trial) not found problem. thank you for advice Best regards S.Pien Solved