I tried this on v18.0.1 and did not experience any error. I'm sorry to say I think it's been happening through all the v19 betas, and I haven't reported it until now. Mea culpa.
When I try to create a new custom toolbar button on any toolbar, Slickedit complains if I try to set the caption in the button's Properties dialog. I get the stack error below. If the default caption of "Sample Button" is kept, no error occurs. Because of this error, I can't create any new custom toolbar buttons with captions of anything other than "Sample Button."
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Slick-C Stack
Control ctlcaption referenced but does not exist
tbprops.ex 1747 _ToolBarProperties_form.ctlok.lbutton_up() p_window_id: 498 p_object: OI_IMAGE p_name:
dlgman.ex 1510 _ainh_dlg_manager.enter() p_window_id: 390 (invalid)
dlgeditv.ex 7013 show(-modal _ToolBarProperties_form,487) p_window_id: 510 p_object: OI_FORM p_name: _tbtools_form
tbprops.ex 927 tbControlProperties(487) p_window_id: 14 p_object: OI_EDITOR p_name:
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SlickEdit 2014 (v19.0.0.11 64-bit)
Serial number: FE11473_BETA
License type: Beta License
License expiration: 2014-12-18 11:30:00
License file: C:\ProgramData\slickedit\19\slickedit.lic
Build Date: October 31, 2014
Emulation: CUA
OS: Windows 8 x64
OS Version: 6.02.9200
Memory: 42% Load, 2547MB/6031MB Physical, 3930MB/12175MB Page File, 277MB/134217727MB Virtual
Shell Info: C:\WINDOWS\system32\cmd.exe /q
Screen Size: 1920 x 1080
Project Type: No project open
Language: .txt (Plain Text)
Encoding: Automatic
Installation Directory: C:\Program Files\SlickEditV19.0.0 x64\ (non-removable drive,NTFS,453780MB free)
Configuration Directory: C:\Users\David\Documents\My SlickEdit Config\19.0.0\ (non-removable drive,NTFS,453780MB free)