Two problems when using the paths tool to draw objects on a vector layer are that when you draw two objects and link them together, when you try to move them, they are invisible until you ungroup them or you close the project file and reopen it. This happens every time I use the paths tool and anyone can recreate the situation easily. Also when you reopen your project file, any paths you created on those vector layers tend to distort on their own to small degrees at various points.

Reproducible: Always

Steps to Reproduce:
For bug one...
1. open a file and create a vector layer.
2. use the paths tool to draw an object, then draw a second one.
3. link the two objects together as a group, then try to move them around.
For bug two...
1. repeat the previous steps one and two
2. save your image and then close your project file, then reopen it and examine it for any out of place lines.

Actual Results:  
After I repeated my own steps, the results were the same each time.

Expected Results:  
For bug one: The software should have adapted the link objects together and shown them as visible when moving them immediately after being linked.
For bug two: The software should have retained the lines of the object you draw exactly as it was when you last saved and closed the file down. 

I really like using krita, especially for its Path's drawing tools because I like to draw mechanical things and its otherwise a very easy experience and program to work with. Those two little bugs are highly annoying however when you have to stop your work and then reload it to resume, or when you reopen your project only to find your line work is out of place and messes with your precision.