ZBrushCentral

Hi guys im having some problems

So hi guys, this is my first thread… im having some problems, i was sculpting a model on zbrush and i wanted to append some measure guides object as a subtool. As soon as i append it im not able to see or to select my other subtool, i select it but it immediatly goes back to the guides subtool and my other tool even stops being visible without me making it invisible. I tried to restart the program several times but it doesnt help, the only way for me to select the ztool i was working is to delete the measure guides.
What is going on? im sorry if this is a noob question but id really appreciate some guidance. thanks guys