You don't say which version of software you are using, but how connections are maintained depends on how complex the symbols are that are being replaced. DxDesigner will try and maintain connectivity but if the symbols have different pin spacing or are different sizes it cannot always do so.
On your second question, how are you trying to add a special component? You can draw a net and attach the symbol to it or you can select the symbol from the Special Components button and connect that to a net. You can also connect directly to a pin but you should always create a small net stub by moving the special component away from the pin (connect by abutment). If you have multiple special component symbols defined for each type you can use the 'Change' option from the right mouse context menu to switch to one of the alternatives.
I think, I have a problem between the DX Designer grid and the symbol editor grid. But two grids are the same (5 mm ). Also, pins are properly placed into symbol outline. Whats the problem?
I work with EE.9.4 version.
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From the picture ot looks like you don't have the grid switched on in DxDesigner. if this is the case then the grid snapping is also off. Try selecting the nets, switching on the grid and using the snap to grid command. if this is not the case then post your resistor symbol to this forum.
The problem was that I had the "automatic outline update" option enable in the symbol editor preferences.
Thanks for your time!
Glad to hear it is fixed, will you mark the Idea as answered please.