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Unable to select some elements in the 3D model, what could be the problem?
This could be due to bad data, first try File > Compress to clear any unnecessary data in the file. Sometimes that's all it needs to resolve this type of issue(s), if that doesn't work try the following:
1- Copy and Paste, use Edit > Copy in AECOsim to select the elements in the bad file and paste it into a new file, this will place all the elements as new and free from all bad data.
2- Reference the bad file, create a new file and reference the bad file into the new file, copy all the elements from the reference and then detach it.
3 - Use Key-in TFREBUILD this may also help regenerate the elements and stripped them from bad data. First select all the elements in the file and apply the KEy-in TFREBUILD.
As a good practice always back up your files to prevent loss of data.