Found this while looking over changes to the tech trees over the weekend:

In all previous versions of the game, the Generic Tech Tree (TechDefs.xml) had the following tech:

<InternalName>GenericLifeSupport</InternalName>
<GenericName>LifeSupport</GenericName>
<DisplayName>GenericLifeSupport_Name</DisplayName>
<TechTree>Generic_Tree</TechTree>
<ShortDescription>GenericLifeSupport_ShortDec</ShortDescription>
<Description>GenericLifeSupport_Dec</Description>
<ColorDef>TechLemon</ColorDef>
<Icon>GC3_Support_Icon.png</Icon>
<Bink>GC3_Life_Support_Temp.bk2</Bink>
<ResearchCost>60</ResearchCost>
<TechPoints>1</TechPoints>

It now has this instead:

<InternalName>GenericAquaticSupportSystems</InternalName>
<GenericName>AquaticSupportSystems</GenericName>
<DisplayName>GenericAquaticSupportSystems_Name</DisplayName>
<TechTree>Generic_Tree</TechTree>
<ShortDescription>GenericAquaticSupportSystems_ShortDec</ShortDescription>
<Description>GenericAquaticSupportSystems_Dec</Description>
<ColorDef>TechLemon</ColorDef>
<Icon>GC3_Support_Icon.png</Icon>
<Bink>GC3_Life_Support_Temp.bk2</Bink>
<ResearchCost>60</ResearchCost>
<TechPoints>1</TechPoints>

This will break the rest of the life support branch of the Generic Tech Tree, as it will be looking for the tech LifeSupport to continue research.

It is the only Aquatic tech in the entire tree.  I figure someone was using the Generic Tech Tree to build the Torian one and that slipped in/stayed in by mistake.  

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Also, the following tech is repeated in the Generic Tech Tree:

<InternalName>GenericLossLessSupportSystems</InternalName>
<GenericName>LossLessSupportSystems</GenericName>
<DisplayName>GenericLossLessSupportSystems_Name</DisplayName>
<TechTree>Generic_Tree</TechTree>
<ShortDescription>GenericLossLessSupportSystems_ShortDec</ShortDescription>
<Description>GenericLossLessSupportSystems_Dec</Description>
<ResearchCost>128</ResearchCost>
<TechPoints>1</TechPoints>

The first instance of it (which is right after LifeSupportOptimization3 in the tech tree) is supposed to be:

<InternalName>GenericSupportFieldGeneration</InternalName>
<GenericName>SupportFieldGeneration</GenericName>
<DisplayName>GenericSupportFieldGeneration_Name</DisplayName>
<TechTree>Generic_Tree</TechTree>
<ShortDescription>GenericSupportFieldGeneration_ShortDec</ShortDescription>
<Description>GenericSupportFieldGeneration_Dec</Description>
<ResearchCost>128</ResearchCost>
<TechPoints>1</TechPoints>

 Since these are pure XML errors, I'm not sending any tickets or files, as I figure it is easily verifiable and fixable.