No access on replaced nodes after a "replaceChild"

Hi developers,
after replacing a node in a DOM Document with ...replaceChild(newNode,oldNode) any access to nodes on the newNode fails by getting null.
(The accessed Document is of xHTML 1.0 transient )
Example:
          Element fSet = (Element)viewDoc.getElementById("fSet");
          Node oldTab = viewDoc.getElementById("TabName");
This works without problem!
          Element newTab = (Element)oldTab.cloneNode(true);
(It is for example only, in original a basic copy of the Tab Node is replaced, but that works just as little as the other one)
          fSet.replaceChild(newTab,oldTab);
          Node Tab = viewDoc.getElementById("TabName");
Now i get "null", why?
Any access like ...getElementByID or ...getElementsByTagName fails getting always a null result only?
What is wrong?
Tanks for any help!
ApeVeloce

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you boot, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal boot may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, reboot as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

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