When you save the TW file as pln, then all objects are released, they all become editable. And still you can not move some objects then make sure they are not locked, or not in locked layer.
Also make sure they are not part of the modules.
Upto AC 22
iMacs and MacBookPros: Mac OS X (10.6 to 10.12, Intel core 2 Quad to i5, i7, 8 GB to 16GB)
Win 10, AMD Opteron 6-Core x 2, 16GB, FirePro W4100 2GB
& ThinkPad E550
& i7, 8GB