If you are transcribing into any program except for Microsoft Word and you want to add timestamps, the FTW Transcriber uses the Windows clipboard to insert them. This means that when inserting timestamps with the FTW Transcriber you cannot use the Windows clipboard for other purposes such as inserting text.
The exception is Microsoft Word. The FTW Transcriber does not normally use the Windows clipboard to insert timestamps into Word, so you can use the Windows clipboard normally. However, if that does not work, e.g. if a new Windows update prevents it, you can set the FTW Transcriber to insert timestamps into Word via the clipboard, by going to the FTW Transcriber’s Settings menu and checking the box marked “Add Word timestamps from clipboard”.