Ignore. I believe this error is a non-issue. In what sense? In that it does not apply to anything. I tried to open a number of termbases from the Termbase Management pane and clicking on "Load" within the Catalog Actions of the ribbon. You will always get the same error, regardless. Why? It depends on what you have selected. If it is on top of the list, i.e. the termbase name, or even without no open termbase, and you press "Load" you get "Load termbase from file", and when you try to open ANY termbase, you get the error in question ("Invalid character..."). What does "Load termbase from file" mean in the first place? It does not make a lot of sense. However, if you select a specific item, say, "Definition" or "Layouts", etc. then the "Load" function will actually work, at least showing the right type of file (.xdt, .xdl, etc). On the other hand, to open a termbase you simply go to the Home tab and click on the "Open Termbase" icon. That shouldn't be a problem. Again this is an error that is not documented and does not make sense at all.

Ignore. I believe this error is a non-issue. In what sense? In that it does not apply to anything. I tried to open a number of termbases from the Termbase Management pane and clicking on "Load" within the Catalog Actions of the ribbon. You will always get the same error, regardless. Why? It depends on what you have selected. If it is on top of the list, i.e. the termbase name, or even without no open termbase, and you press "Load" you get "Load termbase from file", and when you try to open ANY termbase, you get the error in question ("Invalid character..."). What does "Load termbase from file" mean in the first place? It does not make a lot of sense. However, if you select a specific item, say, "Definition" or "Layouts", etc. then the "Load" function will actually work, at least showing the right type of file (.xdt, .xdl, etc). On the other hand, to open a termbase you simply go to the Home tab and click on the "Open Termbase" icon. That shouldn't be a problem. Again this is an error that is not documented and does not make sense at all.

In addition, I know for a fact that this does not happen in MultiTerm 2015 and MultiTerm 2014. It is only in MultiTerm 2017 and 2019. Basically, the "Load" icon is not suppossed to be activated unless you have selected (within an open termbase) any of the available choices: Definition, Layout, etc. This article in the SDL knowledge base clarifies this issue even more: "The "Load..." function in SDL MultiTerm is not supposed to open termbases rather termbase objects for already opened termbases." gateway.sdl.com/.../communityknowledge

Still encountering this in SDL MultiTerm 2019. In additional in Termbase Management I do not get the options to "Import" or "Export" my TermBase.