Did Linus Larrabee really love Sabrina?

I love this film... and it's one of few films I share equal love for both the original and the remake.

I've personally never had the problem that you do. I think the story is compelling and clear. Linus loves Sabrina and she loves him.

You said it yourself... Why would Linus find her in Paris if he didn't love her? He'd already solved the problem... there was no need to chase her otherwise. David is sticking with his fiance and facilitating the merger with Tyson and Sabrina has everything she needs to stay in Paris for as long as she likes, between Linus' offer and her father's money. He must love her. That's the only reason he would chase after her.

So, why don't you feel it? Well, I wonder if at least part of it could be attributed to Ford's let's call it "wooden" romantic performance. Linus is supposed to be stiff, driven, and single-minded. Utterly analytical and unfeeling. This is a great role for Ford, who often comes off as a pretty flat romantic performer. He's a great straight-man (Han Solo), can carry a film as a dramatic lead (Blade Runner), plays a good clueless romantic (Indiana Jones, Han Solo)... but he's really not much of a romantic lead. Even in one of my favorite films, Working Girl, a romantic comedy, his character seems to be generally romantically inept... which is part of what makes him in it cute.

This, then, makes you wonder if it wasn't intentional. Linus, like Ford, probably has difficulty expressing love. They spend much of the film showing that he's pretty "above" those feelings, if only because he's so involved with work. So, perhaps it makes sense that when he finally figures it out and expresses himself, he'd seem a bit stiff. He's doing this for the first time and struggling with how he feels.

But Linus has certainly done the "work" of falling in love. For all that he seems disconnected to Sabrina, he actually recognizes her when she returns from Paris initially, seems informed about where she was and what she was doing there, understands her interests enough to come up with things for them to do together that would make her interested in him over his brother. This may be an overly analytical way of deciding what "love" is but I'll go a step further.

We don't really know how long Sabrina has been home from Paris. It's probably a few weeks. Would a couple generally be even thinking about declaring love for each other after a month of dating? Unlikely. And these two haven't even been "dating", they've been spending a lot of time together, sure, but that's not really the same thing. Perhaps the reason you don't buy it is that... well... it's a bit far fetched. But, well, it is a movie.